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Modeling the physiological responses of a desert shrub to rainfall pulses in an arid environment in northwestern China
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jaridenv.2020.104277
Hu Liu , Chuandong Wu , Yang Yu , Wenzhi Zhao , Qiyue Yang , Sijia Wang , Jintao Liu

Abstract A physically-based model for soil-plant-atmosphere continuum (SPAC) is parameterized and evaluated against field-measured physiological responses of a desert shrub, Haloxylon Ammodendron (HA), to rainfall pulses in a desert environment in northwestern China. Despite its simplicity, the model was successfully employed to assess the complexity and uncertainty involved in the physiological responses of HA following pulsed rainfall events. Through modelling efforts, we report a systematic evaluation of the non-linear relationship between the physiological responses of HA and pulse magnitude or antecedent moisture. The results show that following the rainfall pulses, the modeled daily transpiration and assimilation rates either stayed the same or decreased monotonically with water stress. However, the stomatal conductance (gs) and photosynthetic rate (An) responses were relatively weaker when compared to the increase in water potential. We found that rainfall events with
更新日期:2020-12-01
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